hillary clinton versus joe biden? >>> and the national investigates "zero dark thirty," the film's screenwriter is here to respond. we'll be right back. we're sitting on a bunch of shale gas. there's natural gas under my town. it's a game changer. ♪ it means cleaner, cheaper american-made energy. but we've got to be careful how we get it. design the wells to be safe. thousands of jobs. use the most advanced technology to protect our water. billions in the economy. at chevron, if we can't do it right, we won't do it at all. we've got to think long term. we've got to think long term. ♪ ♪ it's the >> some of our peers on the other side expressed their ambitions for your future. >> i salute you and look ahead to 2016 wishing you much success and extending to you my highest regards. >> madam secretary, at first let me thank you for your service and i wish you the best in your future endeavors mostly. [ laughter ] >> a little bit of a love fess up there. a lot of speculation over secretary clinton's future even during